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Related Concept Videos

Simplified Synchronous Machine Model01:30

Simplified Synchronous Machine Model

754
The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
In this model, each generator is connected to a...
754
Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

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Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
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Group Synchronization During Collaborative Drawing Using Functional Near-Infrared Spectroscopy
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[Synchronous Multicentric Thymoma].

Shigeto Nishikawa1, Tetsu Yamada, Terumasa Sowa

  • 1Department of Thoracic Surgery, Takatsuki Red Cross Hospital, Takatsuki, Japan.

Kyobu Geka. the Japanese Journal of Thoracic Surgery
|July 4, 2019
PubMed
Summary
This summary is machine-generated.

This study reports the first case in Japan of synchronous multicentric thymoma with distinct Type A and Type B2 histology. The patient successfully recovered after surgical removal of both encapsulated thymomas.

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Area of Science:

  • Thoracic Surgery
  • Oncology
  • Pathology

Background:

  • Thymoma is a rare tumor originating from the thymus.
  • Multicentric thymoma, involving multiple sites within the thymus, is uncommon.
  • Synchronous thymomas with differing histological subtypes present unique diagnostic and therapeutic challenges.

Observation:

  • A 76-year-old male presented with an abnormal chest X-ray finding.
  • Chest CT revealed two distinct nodular lesions in the anterior mediastinum, measuring 9 cm and 3.5 cm.
  • Surgical resection via median sternotomy was performed.

Findings:

  • Histological examination confirmed two synchronous thymomas: Type A and Type B2.
  • Both tumors were completely encapsulated and classified as Stage I according to Masaoka's classification.
  • The patient remained recurrence-free for 11 years post-surgery.

Implications:

  • This case highlights the possibility of synchronous multicentric thymoma with divergent histological types.
  • Complete surgical excision is effective for early-stage, encapsulated thymomas.
  • Long-term surveillance is crucial for patients with thymoma, even after complete resection.